Fuel cut-off means for power-operated liquid-fuel-burning apparatus



June 5, 1928. 1,672,213

s. M. HANSEN FUEL CUT-OFF MEANS FOR POW-ER OPERATED LIQUID FUEL BURNING APPARATUS Original Filed July 20, 1925 2 Sheets-Sheet 1 flaw; 7712557659 June 5, 1928. 1,672,213

I S. M. HANSEN FUEL CUT-OFF MEANS FOR POWER OPERATED LIQUID FUEL BURNING ARPARATUS Original Filed July 20, 1925 2 Sheets-Sheet 2 7112a? vo 7'.

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Patented June 5, 1928.

"UNITEDVSTATES PATENT OFFICE.

SINIUS M. HANSEN, OF'LYNN, MASSACHUSETTS, ASSIGNOR, BY DIRECT-AND MESNE AS- SIGNMENTS, TO A T OIL BURNER 00., OF LYNN, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

FUEL CUT-OFF MEANS FOR POWER-OPERATED LIQUID-FUEL-BURNING APPARATUS.

Original application filed'Iuly 20, 1925, Serial No; 44,777. Divided and this application 1926. Serial No. 123,489. 1

This invention relates to fuel cut-off ing apparatus.

Theprimary object of the invention is to I prevent a dangerous accumulation of unignited fuel in the fire pot, due to such causes as the dripping of fuel from the burner tip, or the expulsion thereof from the tip ininstances wherein the pilot has failed to ignite it, and unless the fuel supply was cut off, a dangerous situation would result, particularly if the burner was subsequently lighted when a large quantity of fuel had accumu lated in the fire box.

It is an object of the invention to catch the dripping or expelled unignited fuel and conduct it away from the fire box and to utilize it as a means to initiate the actuation of means to cut off the fuel supply and simultaneously stop the motive power.

It is a further object of the invention to so arrange the fuel'supply'means as to be under the control of a cut-off of simple yet efiicient and durable construction mechanically operated by means which simultaneously effects an electrical circuit in which a motor is located, and a circuit in which an alarm is located.

Another object of the invention is'to provide means to cutoff, the fuel supply, and simultaneously stop the motor in the event that the fuel level regulator overflows.

It is also an object of the invention to so arrange the fuel supply. cut-off means that once havingbeen operated it cannot be reset to open the fuel line until such time as the cause of its operation has beennoted and removed. y 1

Other objects of the invention will be fully understood from a description of the drawings and the claims hereinafter given.

Of the drawings:

Figure 1 represents a side elevation of one form of oil burner having the invention applied thereto, certain portions being broken away.

Figure 2 is an elevation of theburner looking toward the left, Figure 1.

Figure 3 is a view of the fuel supply cutoff means looking toward the right Figure 1, the covers thereof being broken away for clearness.

Figure 4 is a section on the line 44 Figure 3.

Figure 5 is a section on the line 5-5 Figure 3. v i

Figure 6 is an enlarged view in section taken on the line 66 Figure 3.

Figure 7 is a diagram of the motor and alarm circuits. 7

Like characters represent like parts throughout the several figures of the drawing.

Referring to the drawings:

The drawings ,herewith illustrate the invention as applied to a liquid fuel burner such as shown and described in an application. filed by-me July 20, 1925, Ser'. No.

44,777 and of which the present invention was originally a part.

Generally speaking the burner shown consists in a motor M, a blower B, a pump P, a burner tip of preferably,ibut not-neces sarily, the turbinetype T, a 'pilot L, and fuel supply cut-01f means F, each of which is supported directly or. indirectly'on a base The fuel tank or container, not shown, is preferably so situated as to feed the fuel level regulator 12, of well known construe-- tion, by gravity through the pipe 13, valve v 14, and pipe 15, the said regulator having a float controlled needle valve,not shown, arranged to' maintain a substantially uniform levelof fuel therein, so that a uniform head or pressure of fuel is maintainedfrom which the pump P draws its supply.

Leading from the regulator 12 is a'pi'pc 16 connecting with a T fitting, one branch of which 17 leads to the pump P, and another branch li-l'leads to a pilotL which may be of any usual or suitable construction or arrangement. I

From the pump outlet a pipe leads, having a valve fitting'QO arranged to control theflow of fuel throughthe pipe 21 to the burner tip T. I j x In the. present instance the burner tip T is located at the end of a pipe22 which leads from the blower Band may be of any usual or suitable construction or arrangement. I

Below the burner T is a drip pan 51, see Figure 1, arranged to catch unignited fuel expelled from the burner or any dripping therefrom, and lead it to the chamber 59 through a pipe 58.

The chamber 59 has mounted therein a float 60 having a hollow stem 61 upwardly extended therefrom, and through a hole in the base 10, and a hole in the bottom of a switch box 62, said float being guided by a rod 61 fast at its lower end to the bottom of the chamber 59 as plainly seen in Figure 3 of the drawings.

At one side, and near the bottom of said chamber 59, is a valve or spigot 63' arranged to drain said chamber when occasion requires.

The switch box 62 has bearings therein for the pivot of a lever 64 at the upper end of which is a rod 65 suitably insulated from said lever, and arranged to make or break the electrical circuit in which the motor M is located.

Pivoter to the lever 64 is a bar or rod 66 having in turn links 67 pivoted to it, said links being also pivoted to the upright 68, and in conjunction with the bar 66, forming a toggle the movement of which is limited by the washer 69 in one direction, said washer being secured to the bar 66 by a screw 70 which extends below the bar for another purpose to be presently described.

Pivoted to the upright 68 is a lever 71, the free end of which is arranged to be nor mally in contact with the stem 61, and adj acent its pivot'in light contact'with the end of the screw 70, so that fuel entering the chamber 59 will cause the float 60 to rise, and the stem61 thereof to force the lever 71, and the screw 70 upwardly causing the toggle to break, and withdraw the rod 65 from the spring contact points 72 and 7 3 thus opening the circuit and stopping the motor M.

The arrangement of the burner in general is such that stoppage of the motor would be suflicient to stop the feed of fuel to the burner tip, but as a matter of safety it is deemed best to provide means to cut 06? the fuel supply simultaneously with the breaking of the electrical circuit, the mechanism for which will now be described.

The valve fitting 14 previously briefly referred to and into which the supply pipe 13 leads, and from which the pipe 15 leads to the fuel level regulator 12, has provision therein for the diaphragm 74, see Figure 5 of the drawings, against which the headed ends of the plungers 75 and 76 abut when the burner is in operation.

The plunger? 5 is sliclingly mounted in a plug 77 and extends through the wall 78 of the switch box 62 and contacts with the lever 64, while the plunger 76 having the valve 79 thereon is under the influence of a spring 80 which constantly tends to force the valve 79 onto its seat 81 to close the passage 82 between the inlet passage 83, and the outlet passage 84. I

When the float 60 rises, and the toggle is broken, the spring 80 forces the plunger 76 to the left closing the passage. 82, and through the diaphragm 7 and plunger 7 5 forces the lever 6& into the dotted'line position shown in Figure 3 of the drawings, breaking the motor circuit, and in this instance closing an alarm; circuit as indicated at 85, thus simultaneously breaking the motor circuit, cutting ofl' the fuel supply, and by an alarm of one sort or another indicating that fact. i

The lever 64 has a link 86 connected thereto which extends through the wall 78, and serves as a resetting device for the toggle when it has been broken to stop the operation of the burner.

So long as there is sufficient fuelor liquid in the chamber 59' to cause the float 60 to break the toggle, the said toggle cannot be reset, and consequently the burner must remain inactive until such time as the chamber 59' is emptied for which purpose the valve or spigot 63 is employed.

In the event that the fuel level regulator 12 should flood, an overflow pipe 87 is provided which leads into the chamber 59, and the fuel or liquid is directed thereto which causesthe float 60 to rise to actuate the fuel supply cut-off means as above explained.

Having described the invention I claim:

1. A liquid fuel burning apparatus com:

prising a motor; a blower; a pump; a pilot;

a burner tip portion; a main fuel supply means; cut-off means for said fuel supply means; a drip catcher locatedbelow said tip portion and pilot; a reservoir arranged-to collect drip from said catcher; a float in said reservoir; a stem upwardly extending from said float; a member arranged to co-act with said stem to break a toggle; a toggle arranged to be broken through the agency of said stem and member; a member arranged to be operated upon the breaking of said toggle to thereby release said cut-off meansto out off said fuel supply; and means to. drain said reservoir.

2. A liquid fuel burning apparatus comprising a motor; a blower; a pump; a burner tip portion; a pilot; a circuit in which said motor is located; a main fuel supply means; cut-off means for said fuel supply means; a drip catcher located below said tip portion and pilot; a reservoir arranged to receive drip from said catcher; a float in said reservoir; a stem upwardly extendingfrom said float; a lever arranged to; co-act with said stem to break a toggle; a toggle; a member arranged to be operated upon the breaking of said toggle to thereby release said cut-off means to cut off said fuel'supply; electrical contacts in said circuit; means carried by said member to engage said contacts and to disengage therefrom upon the breaking of said toggle whereby the motive power for said blower and pump is shut down.

3. A liquid fuel burning apparatus com prising a motor; a blower; a pump; a burner tip portion; a pilot; a main fuel supply means; a main fuel supply cut-off means; a fuel level regulator; an overflow means for said regulator; a drip catcher located below said tip portion and said pilot; a reservoir; means to direct drip from said catcher to said reservoir; means to direct overflow from said regulator to said reservoir; a float in said reservoir arranged to initiate the operation of said cut-off means upon a predetermined level of fuel in said reservoir; said means including a toggle and a spring pressed lever; means to drain said reservoir; and means to reset said cut-off means after the operation thereof.

4. A liquid fuel burning apparatus comprising a motor; a blower; a pump; a burner tip portion; a main fuel supply means; a fuel level regulator; a drip catcher; a reservoir into which said drip catcher discharges; a float within said reservoir arranged to initiate the operation of a main fuel cut-off means; means operable by said float to re lease said cut-off means, said float operated means including a toggle and a spring pressed lever; a main fuel supply cut-off means comprising a valve and a spring; and

means intermediate said lever and said spring including a diaphragm and a plunger arranged to complete the breaking of said toggle when started by said float; means to drain said reservoir; and means to reset said cut-off means after the operation thereof.

5. A liquid fuel burning apparatus comprising a motor; a blower; a pump; a burner tip portion; a main fuel supply means; a fuel level regulator; a drip catcher; a reservoir into which said catcher discharges; a float within said reservoir arranged to initiate the operation of a main fuel cut-off means; means operable by said float to release said cut-off means; said float operated means including a toggle and a spring pressed lever; a main fuel supply cutoff means comprising a valve and a spring; means intermediate said lever and sa d spring arranged to complete the breaking of said toggle when started by said float; an electric circuit in which said motor is located; contacts in said circuit; and means carried by said lever arranged to engage said contacts to closethe circuit and to simultaneously disengage therefrom upon the breaking of said toggle Signed by me at Lynn Massachusetts this 21st day of May, 1926.

snuus MQHANSEN. 

